Erick,
My guess; The point is using up the resource - adn since he's a behaviorist - to shock people. This is just playing on innate human fear.
replace part of the 75 pounds of meat humans eat each year with some human - viola, fewer cows needed.
if he was serious, he would have followed the UN narative about eating insects. I think it was simple self promotion.
I think this quote from the transcript illustrated it "Are we humans too selfish to live sustainably?"